Doug,

Okay... I'm working on getting all the information/measurements to calculate the CFZ for my setups.  However, I'm having difficulty finding an estimate of "seeing" for various conditions.  I use Astrospheric to monitor and predict conditions in my area.  Is there a rough equivalent for their ratings of excellent, good, average, etc. to seeing arc-seconds?  I read some articles about measuring double stars... but wow.  I've looked for other sources on how to estimate the seeing in arc-seconds, but am not coming up with anything.

Thanks,

Ron

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